Figure 1a shows the QY and peak PL wavelength of manufactured CIS NCs at different temperatures during the time course of NC growth. At a reaction temperature of 230 C, the growth of CIS NCs is slow and PL wavelength peak shifts gradually from 665 to 720 nm. A maximum QY was reached after 70 min likely due to a minimum in total defects from both core
and surface components. NC precipitation was observed after 150 min.